This is not the place for the best burger in Champaign. BUT - they do make good burgers! I don't love fries so I won't speak to that. They have great toppings that don't cost anything extra when creating your own burger. If you're not sure what would be good, they have some favorite creations that you can choose from that are all pretty solid.
If you have kids, they have a reading program where your child(ren) can get a free burger every time they read 5 books! Wonderful program and this is where we do a lot of dinners with friends from school.